* I've heard a similar sound when ricocheting wooden beads launched from a slingshot. I figure that the projectile tumbles at high speed after glancing off somethin like concrete.

* Another weird sound is that made by bowling balls when launched through the air. The holes whistle, and as the ball turns, the sound warbles. At one point in the history of the Denver Mad Scientist's Club, we were determining the range of our air cannon. So we stood downrange with GPS in order to mark the point at which the ball landed. You could hear and see the ball in the air a long way off, so setpping out of the way wouldn't be too hard. We got about 3000 feet, or 1/2 mile.

I know I'm late to this, but it doesn't go faster than the wind - when the wind is behind it, it crawls along. I think it may be moving purely because the wind is pushing the sails, not turning them.

As soon as it is heading into the wind, the sails are being turned the right way for driving the wheels, so the vehicle picks up speed (although the featureless terrain makes it very hard to tell exactly how much speed).

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Bio:stanislav.drca@yahoo.co.uk
stanislav.drca@gmail.com
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One of my favorite inventors, and one of the most brilinat minds that ever walked the Earth is Nikola Tesla.
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